Looking fine on desktop for me - it might also be browser dependent. I'm using firefox, bu I know that chrome makes text look much smaller, a lot of the time. (Let's just forget about the unusable uselessness that is edge). Was surprised to see how smart the header looked, as it all looked a bit bulky on mobile chrome.

As for the ads - they just scroll out of the way. I use one forum with ads that do not, so they are there, consantly!